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Sidewall
The portion of a tire
:
between the tread and the bead.
Speed Rating
An
:
alphanumeric code assigned to
a tire indicating the maximum
speed at which a tire can
operate.
Traction
The friction between
:
the tire and the road surface.
The amount of grip provided.
Tread
The portion of a tire that
:
comes into contact with
the road.
Treadwear Indicators
bands, sometimes called wear
bars, that show across the tread
of a tire when only 1.6 mm (1/
16 in) of tread remains. See
When It Is Time for New Tires
on page 10-56.
UTQGS (Uniform Tire Quality
Grading Standards)
:
information system that provides
consumers with ratings for a
tire's traction, temperature, and
treadwear. Ratings are
determined by tire
manufacturers using
government testing procedures.
The ratings are molded into the
sidewall of the tire. See Uniform
Tire Quality Grading on
page 10-59.
Vehicle Capacity Weight
number of designated seating
positions multiplied by
68 kg (150 lb) plus the rated
cargo load. See Vehicle Load
Limits on page 9-15.
Narrow
:
Vehicle Maximum Load on the
Tire
Load on an individual tire
:
due to curb weight, accessory
weight, occupant weight, and
cargo weight.
Vehicle Placard
permanently attached to a
A tire
vehicle showing the vehicle
capacity weight and the original
equipment tire size and
recommended inflation pressure.
See Tire and Loading
Information Label under Vehicle
Load Limits on page 9-15.
Tire Pressure
Tires need the correct amount of
air pressure to operate
effectively.
The
:
Notice: Neither tire
underinflation nor
overinflation is good.
Underinflated tires, or tires
that do not have enough air,
can result in:
A label
:
Vehicle Care
Tire overloading and
overheating which could
lead to a blowout.
Premature or
irregular wear.
Poor handling.
Reduced fuel economy.
10-49
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